7种必需氨基酸平衡低蛋白质饲粮对31～60日龄清远麻鸡生长、养分消化及肠道组织形态的影响

doi:10.16431/j.cnki.1671-7236.2025.03.012

Abstract

Abstract: 【Objective】 To study the effects of low protein with 7 essential amino acids balanced (lysine,methionine,threonine,isoleucine,arginine,tryptophan and valine) diet on growth and digestive function of Qingyuan partridge chickens at 31 to 60 days of age,and provide support for the application of low protein diet on Qingyuan patridge chickens. 【Method】 A total of 960 healthy Qingyuan partridge chickens (female) at the age of 31 days were selected and divided into 4 groups with 6 replicates per group and 40 chickens per replicate.The chickens in control group were fed a basal diet (crude protein level was 17.5%),the others in experimental groups were fed diets with crude protein level reduced to 16.5% (group A),15.5% (group B) and 14.5% (group C),respectively,with the same levels of lysine,methionine,threonine,isoleucine,arginine,tryptophan and valine as control group.The experiment lasted for 30 days.At 60 days of age,chickens were weighted,and blood and intestinal tissues were collected,and the growth performance,slaughter performance,serum biochemical indexes，apparent digestibility of nutrients and intestinal tissue morphology were determined.【Result】 Compared with control group,① There were no significant differences in growth performance,slaughter performance,serum biochemical indexes and apparent digestibility of nutrients in experimental groups (P＞0.05).② The spleen index of chickens in group B was significantly increased (P＜0.05).③ For duodenum,the crypt depth in 3 experimental groups was significantly increased (P＜0.05),and the ratio of villus to crypt in groups A and B was significantly decreased (P＜0.05).For jejunum,the villus height in group C was significantly increased (P＜0.05),the crypt depth in group B was significantly increased (P＜0.05),and the ratio of villus to crypt was significantly decreased (P＜0.05).For ileum,the villus height and crypt depth in group A were significantly increased (P＜0.05).【Conclusion】 Under the condition of balanced 7 essential amino acids, reducing dietary crude protein level to 16.5%,15.5% and 14.5% could inhibit the development of intestinal tissue morphology to a certain extent,but had no obvious negative effects on growth,serum biochemistry and other indicators.Considering all factors,it was recommended to have a crude protein level of 15.5% in an amino acid balanced diet for Qingyuan partridge chickens.

Key words: low protein diet; amino acid balanced diet; Qingyuan partridge chicken; growth performance; slaughter performance; intestinal morphology

CLC Number:

S815.1

OU Jiancun, HUANG Jian, QIU Ting, CEN Mingzhu, ZHENG Chaojun, WANG Wenhe, HUANG Weilong, ZHANG Huihua. Effects of 7 Essential Amino Acids Balanced Low Protein Diet on Growth, Nutrient Digestion and Intestinal Tissue Morphology of Qingyuan Partridge Chickens at 31 to 60 Days of Age[J]. China Animal Husbandry and Veterinary Medicine, 2025, 52(3): 1102-1112.

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Effects of 7 Essential Amino Acids Balanced Low Protein Diet on Growth, Nutrient Digestion and Intestinal Tissue Morphology of Qingyuan Partridge Chickens at 31 to 60 Days of Age

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